The project has been designed to create an urban link between different adjacent neighborhoods - the Espace Nord, housing the multi-modal train station, and the historical heart of Brussels called “Pentagon”. The Quatuor building will be composed of four towers with 8, 9, 14 and 17 levels respectively, comprising 4 levels at the base to unite all the towers to form a coherent urban development. The towers situated on the west will be less high due to their proximity to existing lower buildings. Conversely, the towers situated to the east side will be higher to extend the alignment of development situated on the north side, and thus create the important Espace Nord entrance vista in town planning terms.

For this entrance to materialise, the Quatuor Building will consist of rounded and soft volumes, with accents such as a walkway connecting the high towers and garden terraces above the base. The sloping roofs add dynamism and allow installation of photovoltaic panels facing south. Triple glazing, thermo-lacquered aluminium joinery and natural stone will be use for the facades and blue stone for the skirting boards. Quatuor Building will also boast an interior, landscaped garden, and an underground car park with 353 places.